They are specifically written for the do-it-yourself-er as well as the experienced mechanic. New Holland T9.390, T9.450, T9.505, T9.560, T9.615, T9.670 Tractor Service Repair Workshop Manual provides step-by-step instructions based on the complete dis-assembly of the machine. It is this level of detail, along with hundreds of photos and illustrations, that guide the reader through each service and repair procedure. Complete download comes in pdf format which can work under all PC based windows operating system and Mac also, All pages are printable. Using this repair manual is an inexpensive way to keep your vehicle working properly.